The N and O atoms are both sp2 hybridized. The sp2 hybrid orbitals (three each for N and O) either form sigma bonds or contain lone electron pairs. The pi bond is formed by overlap of the remaining unhybridized p orbital of N and the remaining unhybridized p orbital of O. Solution The N and O atoms are both sp2 hybridized. The sp2 hybrid orbitals (three each for N and O) either form sigma bonds or contain lone electron pairs. The pi bond is formed by overlap of the remaining unhybridized p orbital of N and the remaining unhybridized p orbital of O..